That seems like a better case than the same issue stopping work at the office so instead of one person out of commission, there's 100 people out of commission and even though they can all go home and work it's basically going to shut down work for an hour or so as they all pack up and head home. Our office has a generator, but it only powers some lights and elevators, the network goes offline after about 20 minutes when the UPS batteries run out.
So it doesn't seem like much of an argument against remote work.